@article{oai:nagoya.repo.nii.ac.jp:00011634, author = {木村, 政昭 and Kimura, Masaaki and 中村, 俊夫 and Nakamura, Toshio and 石川, 賀子 and Ishikawa, Yoshiko}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {^<14>C ages of 18 samples recovered from the sea-floor off Yonaguni-jima and offOkinawa-jima were measured by Tandetron Accelerator Mass Spectrometry of Dating and Materials Research Center in Nagoya University. ^<14>C ages reveal that this area may have been submerged by eustatic rise of seawater during the postglacial stage. Artificial pyramidal configuration of the Iseki Point off Yonaguni-jima may have been made older than 6,000 years on shore, based on ^<14>C age determination and geological observation by scuba diving. ^<14>C ages of stalactite recovered from submarine caves off Ryukyu Islands shallower than 40m showed about 40,000 to 20,000 years BP. These ages are coincident with that of the regression in Wurm glacial age. These is no evidence of large-scaled crustal movement in this area after the postglacial age. Therefore, these stalactite caves may have been formed on the coast during regression stage of the glacial age. In conclusion, the sea-floor near islands in the middle to southern Ryukyu Arc has not been suffered from a big crustal movement and then this area has been mainly submerged by the eustatic movement in late Pleistocene time., タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1999 (平成11)年度}, pages = {210--230}, title = {与那国島遺跡ポイントおよび沖縄本島付近海底から得られた炭酸塩質サンプルの<14>^C年代測定}, volume = {11}, year = {2000} }